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iotests: Use new-style NBD connections 

Old-style NBD is deprecated upstream (it is documented, but no
longer implemented in the reference implementation), and it is
severely limited (it cannot support structured replies, which
means it cannot support efficient handling of zeroes), when
compared to new-style NBD.  We are better off having our iotests
favor new-style everywhere (although some explicit tests,
particularly 83, still cover old-style for back-compat reasons);
this is as simple as supplying the empty string as the default
export name, as it does not change the URI needed to connect a
client to the server.  This also gives us more coverage of the
just-added structured reply code, when not overriding $QEMU_NBD
to intentionally point to an older server.

Signed-off-by: Eric Blake <eblake@redhat.com>
Message-id: 20171109221216.10248-1-eblake@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Eric Blake 2017-11-09 16:12:16 -06:00 committed by Max Reitz
parent 19026817f7
commit 147b44be49
1 changed files with 1 additions and 1 deletions
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2
tests/qemu-iotests/common.rc
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@ -242,7 +242,7 @@ _make_test_img()
if [ $IMGPROTO = "nbd" ]; then
# Pass a sufficiently high number to -e that should be enough for all
# tests
eval "$QEMU_NBD -v -t -b 127.0.0.1 -p 10810 -f $IMGFMT -e 42 $TEST_IMG_FILE >/dev/null &"
eval "$QEMU_NBD -v -t -b 127.0.0.1 -p 10810 -f $IMGFMT -e 42 -x '' $TEST_IMG_FILE >/dev/null &"
sleep 1 # FIXME: qemu-nbd needs to be listening before we continue
fi